Process Control Engineering
80Pages

Camille Bauer AG Process Control Engineering Subject to change without notice PM-1023-000-03-EN-03.13 Camille Bauer AG Aargauerstrasse 7 CH-5610 Wohlen / Switzerland Phone: +41 56 618 21 11 Fax: +41 56 618 21 21 info@camillebauer.com www.camillebauer.com Other product ranges of Camille Bauer HEAVY CURRENT ENGINEERING ANGULAR POSITION ENGINEERING PROCESS CONTROL ENGINEERING

Camille Bauer Local branch offices Camille Bauer AG of Switzerland is affiliated with Metrawatt International GmbH domiciled in Nürnberg (Germany). Our group is represented all over the world by many affiliates and sales partners. The name of GMC-Instruments is composed of the corporate names of Gossen, Metrawatt and Camille Bauer. Germany Switzerland USA GMC-I Messtechnik GmbH Südwestpark 15 D-90449 Nürnberg GMC-Instruments Schweiz AG Glattalstrasse 63 CH-8052 Zürich Dranetz 1000 New Durham Road Edison, New Jersey 08818-4019, USA Phone +49 911 8602 - 111 Fax +49 911 8602 - 777 Phone...

Galvanic isolation Explosion protection through intrinsic safety Intrinsic safety control systems passive signal converters active signal converters signal converters Passive signal Active signal Multifunctional Process management converters signal converters Page 20 Page 30 Page 44 Page 56 Head transmitters Alarm units Isolation amplifiers Power supply units High-voltage isolation control systems additional cables heavy current angular position PROCESS CONTROL ENGINEERING For a smooth flow of information. And cost-effective The more complex a process is designed, the more important are...

PROCESS CONTROL ENGINEERING For a smooth flow of information. And cost-effective processes. The more complex a process is designed, the more important are precise instruments for its continuous progression.

Basics Galvanic isolation Despite the continually increasing level of automation and the proliferation of fieldbus systems in process automation, signal converters are still indispensible. They essentially perform 3 main tasks: • Signal conversion • Galvanic isolation of signals • The amplification of signals In addition, some signal converters can supply 2-wire transmitters. Two distinct systems are available: Passive signal converters designed in the so-called 2-wire technology which obtain their energy directly from the measuring circuit and active signal converters, e.g. isolation...

Basics dangerously high potentials are measured. Despite the fact that a measuring signal may only amount to a few mV, the potential against earth and thus against persons is dangerously high in case of a failure. This is referred to as the working voltage. Figure 4 shows the example of 10 mV measurement on a working voltage of 100 V. Signal amplification This function is reserved for active signal converters since a separate power supply is needed. It mainly concerns applications requiring bridging of long signal paths and the avoidance of interferences. Signal amplication 4…20 mA Figure 5...

Basics Explosion protection through intrinsic safety 1. General aspects 3. Zone classification For the acquisition of signals in hazardous areas, angular position transmitters as well as signal converters of Camille Bauer are designed in the intrinsic safety type of protection “i“. The abbreviation of “i“ is derived from term of intrinsic safety. Hazardous environments are classified in standardised zones, in which gas and dust incentive hazardous areas are differentiated. Zones for hazardous areas due to gas Example The intrinsic safety type of protection uses the fact that a certain...

4. Intrinsically safe equipment Intrinsically safe equipment is installed in a respective hazardous zone. All of the circuits of such equipment must be designed intrinsi- cally safe. The intrinsically safe equipment of Camille Bauer comprises: • Angular position transmitters • Position transmitters • Programmable temperature transmitters Pertaining equipment is exclusively installed outside of hazardous zones. It has the task of safe coupling of electrical signals into hazar- dous zones or discoupling out of them. The circuits of pertaining equipment must be desig- ned, examined and...

Intrinsically safe and pertaining equipment Labelling for electrical equipment according to ATEX ATEX directive Equipment group Explosion protected I— Equipment protection level: Notified Body Equipment category very high degree / Zone 0 high degree of safety / Zone 1 normal degree of safety / Zone 2 Dust group: flammable lint non-conductive dust conductive dust lECEx certificate Labelling for electrical equipment according to lECEx Explosion protected Equipment protection level: Temperature class: Dust group: HIES: non-conductive dust Notified Body

Intrinsically safe and pertaining equipment Hazardous area Intrinsically safe equipment Zone classification 0 - 2 and 20 - 22, equipment group 1 Safe area Pertaining equipment Programmable universal Programmable combined Programmable temperature transmitter transmitter / alarm units transmitter

Intrinsic safety in temperature measurement Temperature is the most frequently measured physical variable. The market thus offers numerous applications and instruments in this respect. For temperature measure- ments in partly closed processes, sheathed thermometers are mainly used. A sheathed thermometer contains a head transmitter which transforms the sensor signal into a mA norm signal. Different instrument designs are used in hazardous areas. The Camille Bauer instruments for hazardous areas are designed for simple applications through to those with fieldbus connection. Different...

Basics equipment, has a type-examination certificate and additionally feeds – in the most adverse case – a second wattage into the Ex-i circuit. This is called an interconnection of two active equipment items whose proof of intrinsic safety is detailed in EN 60 079-14 (Section 12.2.5.2. incl. Attachment B). However, the figure „Parallel connection - current addition“ in Attachment B is only applicable to this case if the power supply unit and the handheld terminal have linear output characteristics. If one of the two characteristics is not linear, the proof must be provided on basis of the...